There is a very interesting thing with Thaumatococcus daniellii:
I made experiment with pure Thaumatine and recognised, that its not only the sweetest natural substance, but also a strong narcotic. I'm getting very tired, 5-10min after ingesting a bit more than a knife point. This last for 2-3 hours.
In the Internet there is very few data about this feature, I only found this:
http://www.yorubarel...nnqdav9b3luldo0
Referring to the structure, which is similar to the allergenic Proteins in Apples and Kiwis (Histamine-stimulators) I guess it could be a Histamine-Receptor-Inhibitor (like Kalanchoe pinnata, Stachytarpheta cayennensis and Diphenhydramine), which would explain the sedative action.
Pure Thaumatin (24-fold enlarged):